"Wanna" ransomware outbreak. Please see this Sophos article sophos.com/kb/126733 for advice on how to protect your organization. Immediate action recommended.
Configuring your network for Explicit Mode requires the following steps.
In general, it is good security practice to only allow workstations to make connections to the internet if absolutely necessary. With the Web Appliance in Explicit Mode, there should be no reason for workstations to connect directly to the internet. Sophos recommends configuring your organization's firewall to only allow outbound internet connections from the Web Appliance. This prevents users from bypassing the security and control provided by the Web Appliance and helps prevent unauthorized use of your network.
To use Explicit Mode, you must configure you users' browsers to use the Web Appliance as their web proxy. There are three methods for automatically configuring your users' browsers from a centralized location.
To make these tasks as simple as possible, Sophos has created the following step-by-step procedures to aid you in automatically configuring your users' browsers to use the Web Appliance as their web proxy:
Further network administration benefits are available by using PAC files for:
Support for problems with third-party products discussed in this article may be provided by the manufacturer of that product. Sophos does not support such third-party products. The third-party products discussed here are manufactured by companies that are independent of Sophos, and Sophos makes no warranty, implied or otherwise, about the performance or reliability of these products.
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